There are broadly two use-cases of phones: content consumption, and utility. The former sucks time to increase "engagement" and has a bunch of social issues around it, the latter does not.
Both of these devices are trying to reduce the time we spend on our phones by addressing the utility aspect, but that's the wrong piece to focus on. The utility aspect is things like checking the time or calendar, booking an Uber, getting food delivered, etc. Many of these utilities however are essentially very optimised checkout funnels. Booking an Uber is really easy, because Uber are incentivised to make it easy. Same with ordering pizza. Taking a highly optimised flow and sticking voice on top isn't going to save time and is going to cause issues. These devices solve the wrong problem.
If a company really wants to improve the world by reducing phone usage (rather than just build their own platform to rent-seek on), maybe they should be looking at social networking, communication, federation, etc.